Querydsl is a framework which enables the construction of statically typed SQL-like queries. Instead of writing queries as inline strings or externalizing them into XML files they can be constructed via a fluent DSL/API.
The benefits of using a fluent API in comparison to simple strings are
* code completion in IDE
* almost none syntactically invalid queries allowed
* domain types and properties can be referenced safely
* adopts better to refactoring changes in domain types
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